Two-cycle engine



Vw. A, Lumens. TWG CYCLE ENGINE.

.PPLICATUN HLD IUNE 6.1919.

Patented Nov. 30, 1920.

WILLIAM A. EWARDS, 0F CHICAGO, ILLINOIS.

.Two-CYCLE ENGNE.

Specification of Letterslateht.

Patented Nov. 30, 1920.

Application med June a, 1919. V serial No; 802,198.

T 0 all' whom t may concern Pre 1t known that I, WILLIAM A. EDWARDS. a cltizen of the United States, residing at hicago, in the county of Cook and Stateof Illinois, have invented certain new `and useful Improvements in Two-Cycle Engine-s. of which the following is a specification.

This invention relates lin general to gas engines and more particularly to the two cycle type in which the gas is preliminarily compressed in the crank case from which it is delivered into the engine cylinder.

In this type of gasengine the gasolene which condenses in the crank case and the heavier particles of the lubricating oil which is fed in with the gasolene, condense and collect in the bottom of the crank case. and feed intermittently in slugs through the passage leading from the crank case into the cylinder, which would result in imperfect explosion and cause uneven running of the en ine. ne of the primary objects of this invention is the provision 'of means for vaporizing the liquids which accumulate in the bottom of the crank case so that they will be fed in the form of vapor to the engine cylinder instead of in rich liquid slugs, and thereby the imperfect intermittent explosions are eliminated and a smooth, eilicient and rhythmic operation of the engine is secured. y

. Another object of my invention is to'further break up and vaporize the explosive mixture in its travel between the crank case and the engine cylinder so as to thereby in crease the eiiciency of the engine. l

Still another object is the provisionof novel means for supplying oil to the wrist pin of the engine crank so as to insure adequate lubrication of this wrist pin durlng operation. `My invention and many of its inherent advantages will be readily appreciated by those skilled in the art by reference to the following description when considered in connection with the accompanydrawings. eferring to the drawings,-

Figure 1 is a vertical sectional View, through one cylinder of a two-cycle engine embodying my invention: and

Fig. 2 is a fragmentary sectlonal View through the {1y-wheel and wrist p1n.

By reference `to the drawings, 1t will be observed that reference character 3 indicates generally the cylinder walls of a two cycle engine provided with the usual water' iacket 4. The top or cylinder cap 5, which may be of any preferred construction, vequipped with the tapped opening G'for a spark plug` 1s secured in position by the usual studs or stay bolts 7. The crank case, designated generally 'by reference character 9. is of the closed type and communicates with the lower end of the cylinder, the crank case and cylinder being shortly coupled but permitting sulicient clearance for the operation of the connecting link or piston rod.y lHVithin the. cylinder the piston 11 is adapted to be reciprocated by means of the connectingrod 12, which is equipped at its lower end with a wrist pin 13 fitted into the ily-wheel 14 mounted upon the engine shaft 15. For the purpose of insuring a supplyof lubricant to the wrist pin,`the outer face of the Hywheel isprovided with a recess 16`increaslng' 1n depth from the center toward the perimeter of the wheel, the ycircumferential walls of the recess being undercut', as indicated at 17', and adjacent thewrist pin` the recess communicates with the wrist pin bearing through a duct 18.' `When the engine is in operation,`oil from the crank case will be thrown by centrifugal force to the periphery of the recess 16 and forced through the duct 18 to the wrist pin bearing, thereby insuring adequate lubrication of this bearing.

The explosive mixture is supplied v'from a carbureter (not shown) 'to the crank case through a port 19 located in'thelower portion of the cylinder so that it willfbe|` fully opened to admit gas to the crank case when the piston has moved downwardlya portion i ofits stroke. The partial vacum created in the crank case by the piston on its upward stroke causes the explosive mixture to rush inwardly through the port 19 as soon as the piston clears the port in its upward travel, and upon downward movement of the piston, this mixture, trapped in the crank case by closure of the port 19, will be compressed by the piston in the usual manner.

The bottom of the crank case is provided with a passage 21 which is inclined downwardly to its junction with the vertical passage 22 opening through the intake port 23 into the cylinder. The condensed gasolene. oil drippings, and other liquid which has a tendency to accumulate in the crank case. will flow through this passage 23 to the lower end thereof where it will tend to accumulate, while the lighter g'as will flow directly from the passage 21 into the passage 22 and thence into the cylinder.

For the purpose of breaking up' the particles ofgasolene in the mixture and further vaporizing the mixture during its passage from' the crank case to the cylinder, I have mounted in the passage 22 a Venturi tube 24. The action of this tube upon the mixture -flowing therethrough further vaporizes the mixture so that it is delivered to the cylinder with the gasolene particles thoroughly broken up and mixed with the air.

For the purpose of causin an even feeding of the condensed partie es of gasolene and lubricating oil which tend to accumulate at the lower end of the passage 21 to the cylinder in finally vaporized condition, I have mounted in the lower end of the passage 21 a vertical tube 25, the upperend of w '.ch terminates in the throat of the venturi. This tube is preferably carried by a screw plug 26 which can be readily removed for purposes of cleaning the tube when necessary, and near its lower end it is provided wlth a plurality of ports or openlngs 27 through which air, gas and the liquid accumulation at this point may enter the tube and be drawn by the vacuum created in the throat of the venturi upwardly through the tube and delivered into the venturi where these liquid particles are thoroughly broken up and vaporized by the action of the venturi. In order to protect the openings 27 against clog ing, I prefer to surround the lower end o the tube 25 with a screen 28, as shown in Fig. 1. l

During the operation of the engine. the mixture from the crank case will flow under pressure when the port 23 is open, through the Venturi tube and the suction exerted by the tube 25 will cause some of the mixture to flow through this tube. All oil, condensed gasolene and other liquids from the crank case tend ing to accumulate in the 1,aeo,ass

passage 21 will b'e drawn into the tube 25 through the ports 27 and will be delivered by this tube into the throat of the venturi where they will be thorou hly broken up, dissipated and mixed with the explosive charge so that an even feeding to the cylinder will result and no liquid slugs will be delivered to the cylinder which would impair the even and rhythmic o eration of the engine. The burnt gases in tiie c linder are dischargedtherefrom through t e exhaust port 29 by the force of the incoming charge in a ma ner which is well understood.

It is believed that my invention and many of its inherent advantages will be understood from the foregoing without further description, but it should be obvious that various changes in the structural details disclosed may be resorted to `without departin from the spirit of the invention as define in the following claims.

I claim:

1. A two cycle engine, comprising a cylinder, a closed crank case, a passage leading from the bottom of said crank case to said cylinder, and vaporizing means disposed 1n said passage..

2. A two cycle engine, comprising a cylinder, a closed crank case, a passage connecting said cylinder with said crank case, and means for vaporizing the liquid tending to accumulate in said crank case. c

3. A two-cycle engine, comprising a cylinder, a crank case, means for vaporizing the liquid tending to accumulate in said crank case, and means for delivering said vaporized liquid to said cylinder.

' 4. A two cycle engine, comprising a cylinder, a crank case, a passage connecting said cylinder and crank case, a venturi disposed in said passage, and means for delivering liquids' from said crank case into the throat of said venturi.

5. 4A two cycle engine, comprising a cylinder, a crank case, a passage connecting said cylinder and crank ease, a venturi disposed in said passage, and a tube communicating with the throat of said venturi and with the 4point of accumulation of liquids from said crank case.

WILLIAM A. EDWARDS. v 

